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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 324,094 $ 350,255 $ 219,414
Adjustments to reconcile net income to cash provided by (used in) operating activities:      
Change in future policy benefits and other policy liabilities 266,513 306,122 256,520
Deferral of policy acquisition costs (432,390) (422,749) (376,879)
Amortization of deferred policy acquisition costs 239,730 209,399 180,582
Deferred tax provision 2,590 (53,788) 44,316
Change in income taxes 2,365 (2,159) 27,601
Realized investment (gains) losses, including other-than-temporary impairments 2,121 (1,339) (4,088)
Accretion and amortization of investments (1,894) (1,596) (1,411)
Depreciation and amortization 12,417 13,551 14,595
Change in reinsurance recoverables 37,261 9,124 (72,880)
Change in agent balances, due premiums and other receivables 16,291 (19,074) (20,069)
Trading securities sold, matured, or called (acquired), net (8,808) 1,137 (2,051)
Share-based compensation 17,251 15,267 13,442
Change in other operating assets and liabilities, net 526 (12,606) 15,335
Net cash provided by (used in) operating activities 478,067 391,544 294,427
Available-for-sale investments sold, matured or called:      
Fixed-maturity securities — sold 51,726 77,444 91,666
Fixed-maturity securities — matured or called 362,413 223,088 254,585
Equity securities — sold   5,771 8,572
Equity securities — sold 2,093    
Available-for-sale investments acquired:      
Fixed-maturity securities (626,826) (430,452) (386,394)
Equity securities   (400) (2,683)
Short-term investments (8,169)    
Equity securities — acquired (521)    
Purchases of property and equipment and other investing activities, net (13,517) (6,752) (13,669)
Cash collateral received (returned) on loaned securities, net (37,224) 16,140 2,164
Sales (purchases) of short-term investments using securities lending collateral, net 37,224 (16,140) (2,164)
Net cash provided by (used in) investing activities (232,801) (131,301) (47,923)
Cash flows from financing activities:      
Dividends paid (44,140) (35,821) (33,367)
Common stock repurchased (210,146) (150,038) (150,057)
Tax withholdings on share-based compensation (6,711) (6,734) (3,970)
Payment of deferred financing costs   (868)  
Net cash provided by (used in) financing activities (260,997) (193,461) (187,394)
Effect of foreign exchange rate changes on cash (2,093) 1,204 572
Change in cash and cash equivalents (17,824) 67,986 59,682
Cash and cash equivalents, beginning of period 279,962 211,976 152,294
Cash and cash equivalents, end of period 262,138 279,962 211,976
Supplemental disclosures of cash flow information:      
Income taxes paid 88,348 83,304 45,402
Interest paid $ 27,899 $ 27,816 $ 27,992